1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License"). You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22 /*
23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #include <stdio.h>
28 #include <ctype.h>
29 #include <string.h>
30 #include <fcntl.h>
31 #include <string.h>
32 #include <sys/types.h>
33 #include <sys/time.h>
34
35 #include <sys/socket.h>
36 #include <sys/sockio.h>
37 #include <net/if.h>
38 #include <netinet/in_systm.h>
39 #include <netinet/in.h>
40 #include <netinet/ip.h>
41 #include <netinet/if_ether.h>
42 #include <netinet/udp.h>
43 #include "snoop.h"
44
45 extern char *dlc_header;
46
47 int
interpret_udp(int flags,struct udphdr * udp,int iplen,int fraglen)48 interpret_udp(int flags, struct udphdr *udp, int iplen, int fraglen)
49 {
50 char *data;
51 int udplen;
52 int sunrpc;
53 char *pname;
54 char buff [32];
55
56 if (fraglen < sizeof (struct udphdr))
57 return (fraglen); /* incomplete header */
58
59 data = (char *)udp + sizeof (struct udphdr);
60 udplen = ntohs((ushort_t)udp->uh_ulen) - sizeof (struct udphdr);
61 fraglen -= sizeof (struct udphdr);
62 if (fraglen > udplen)
63 fraglen = udplen;
64
65 if (flags & F_SUM) {
66 (void) sprintf(get_sum_line(),
67 "UDP D=%d S=%d LEN=%d",
68 ntohs(udp->uh_dport),
69 ntohs(udp->uh_sport),
70 ntohs((ushort_t)udp->uh_ulen));
71 }
72
73 sunrpc = !reservedport(IPPROTO_UDP, ntohs(udp->uh_dport)) &&
74 !reservedport(IPPROTO_UDP, ntohs(udp->uh_sport)) &&
75 valid_rpc(data, udplen);
76
77 if (flags & F_DTAIL) {
78 show_header("UDP: ", "UDP Header", udplen);
79 show_space();
80 (void) sprintf(get_line((char *)(uintptr_t)udp->uh_sport -
81 dlc_header, 1), "Source port = %d", ntohs(udp->uh_sport));
82
83 if (sunrpc) {
84 pname = "(Sun RPC)";
85 } else {
86 pname = getportname(IPPROTO_UDP, ntohs(udp->uh_dport));
87 if (pname == NULL) {
88 pname = "";
89 } else {
90 (void) sprintf(buff, "(%s)", pname);
91 pname = buff;
92 }
93 }
94 (void) sprintf(get_line((char *)(uintptr_t)udp->uh_dport -
95 dlc_header, 1), "Destination port = %d %s",
96 ntohs(udp->uh_dport), pname);
97 (void) sprintf(get_line((char *)(uintptr_t)udp->uh_ulen -
98 dlc_header, 1), "Length = %d %s",
99 ntohs((ushort_t)udp->uh_ulen),
100 udplen > fraglen ?
101 "(Not all data contained in this fragment)"
102 : "");
103 (void) sprintf(get_line((char *)(uintptr_t)udp->uh_sum -
104 dlc_header, 1), "Checksum = %04X %s",
105 ntohs(udp->uh_sum),
106 udp->uh_sum == 0 ? "(no checksum)" : "");
107 show_space();
108 }
109
110
111 /* go to the next protocol layer */
112
113 if (!interpret_reserved(flags, IPPROTO_UDP,
114 ntohs(udp->uh_sport),
115 ntohs(udp->uh_dport),
116 data, fraglen)) {
117 if (fraglen > 0 && sunrpc)
118 interpret_rpc(flags, data, fraglen, IPPROTO_UDP);
119 }
120
121 return (fraglen);
122 }
123